I suspect motivation has played a part in his performance over the years. Playing rear gunner to your designated #1 team mate is not going to inspire you to go 100%.
He has certainly picked up the latter part of this season now that he is looking for a drive elsewhere. See also Ricciardo this year once the seat at RBR became available, Webber at RBR before it clicked that Vettel was the favoured son etc.
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